Course
10K10 km
Key dates
- ★Race daySeptember 2027 · date to be announced
Provisional date, projected from last year — the organiser has not announced this edition yet. We show the month only.
About
The Monarch Ultra 10km is part of a butterfly-conservation festival in Peterborough, Ontario, raising awareness for monarch butterfly migration and habitat protection. The race and festival draw runners and families together each fall alongside the Peterborough Monarch Festival.
Your next race, seen from above.
Save Monarch Ultra 10km to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Save Monarch Ultra 10km to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.